package ooday05;

public class StaticFinalDemo {
    public static void main(String[] args) {
        System.out.println(Loo.PI);//常常通过类名点来访问
        //Loo.PI = 3.1415926;//编译错误，常量不能被改变


        //1)加载Loo。class到方法区中
        //2)静态变量num一并存储到方法区中
        //3)到方法区中获取num的值
        System.out.println(Loo.num);


        //编译器在编译时会将常量直接替换成具体的数，效率高
        //相当于System.out.println(5);
        System.out.println(Loo.count);

    }
}


class Loo{
    public static final double PI = 3.14159;
    //public static final int NUM;//编译错误，常量必须声明同时初始化

    public static int num = 5;//静态变量
    public static final int count = 5;//常量(静态常量)





}
